01 - 
                Wash, peel, and cook sweet potatoes until tender by boiling for 20–30 minutes or roasting at 400°F for about 45 minutes. Mash while warm until smooth, measuring 1½ cups.
              
              
              
                02 - 
                Peel, core, and grate Gala apples finely but with some texture. Lightly squeeze to remove excess moisture, preserving enough juice for flavor.
              
              
              
                03 - 
                Whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger in a large bowl to ensure even spice distribution.
              
              
              
                04 - 
                Beat vegetable oil, brown sugar, eggs, and vanilla extract in a separate bowl until smooth. Stir in mashed sweet potatoes, then gently fold in grated apples.
              
              
              
                05 - 
                Add wet ingredients to dry ingredients. Fold gently with a spatula or wooden spoon until no flour streaks remain, avoiding overmixing to maintain a tender crumb.
              
              
              
                06 - 
                Preheat oven to 350°F. Pour batter into greased and floured 9-inch cake pan. Smooth surface and bake for 35–40 minutes until a toothpick inserted comes out clean or with moist crumbs.
              
              
              
                07 - 
                Cool the cake in the pan for 15 minutes, then transfer to wire rack. For glaze, whisk melted butter and brown sugar; brush over warm cake for a glossy caramel finish.